DFRobot Gravity: IIC Ozone Sensor (0-10ppm)


The Gravity: IIC Ozone Sensor is based on electrochemical principles and it can measure the ambient O3 concentration accurately and conveniently. With high anti-interference ability, high stablility and high sensitivity, this arduino-compatible ozone sensor can be widely applied to fields like portable device, air quality monitoring device, disinfection cabinets and smart home...

This compact dfrobot ozone sensor supports IIC output, it is compatible with many mainboards like Arduino Uno, esp32, Raspberry Pi and so on. Its resolution can reach to 10ppb. It supports wide range input voltage: 3.3V to 5.5V. Moreover, the lifetime is as long as 2 years. With simple Gravity interface and practical sample code, you can build your own ozone concentration monitor easily and conveniently.



Board Overview

Gravity__IIC_Ozone_Sensor_0-10PPM Pinmap

Num Label Description
1 SDA IIC System Data Line
2 SCL IIC System Clock Line
3 GND -
4 VCC +


Download the program to Arduino UNO and open the serial monitor to check the O3 concentration.

warning_yellow.png NOTE: The O3 concentration value will be stable after preheat time, which is about 3 minutes. Please ignore the O3 concentration value during preheat time.


Connection Diagram

Gravity__IIC_Ozone_Sensor_0-10PPM Connection

Sample Code

1.According to the connection diagram to connect the module to Arduino UNO. In default, the IIC address is 0x73 which corresponds to the ADDRESS_3 in the code. If you want to modify the I2C address, please configure the hardware IIC address by the dial switch and modify the IIC address part: ADDRESS_X in the sample code. The relationship between the dial switch and IIC address is shown as below:

2.Download and install the DFRobot_OzoneSensor Library (About how to install the library?)

3.Open Arduino IDE and upload the code below to Arduino UNO.

4.Open the Arduino IDE's serial monitor, adjust the baud rate to 9600, and observe the serial print results.

  * @file  ReadOzoneData.ino
  * @brief Reading ozone concentration, A concentration of one part per billion (PPB).
  * @n step: we must first determine the iic device address, will dial the code switch A0, A1 (ADDRESS_0 for [0 0]), (ADDRESS_1 for [1 0]), (ADDRESS_2 for [0 1]), (ADDRESS_3 for [1 1]).
  * @n       Then configure the mode of active and passive acquisition, Finally, ozone data can be read.
  * @n note: it takes time to stable oxygen concentration, about 3 minutes.
  * @n The experimental phenomenon is to print one billionth of the ozone concentration on the serial port.
  * @n Because the value measured by the sensor is less than 10000, the value obtained will not be greater than 10000
  * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (https://www.dfrobot.com)
  * @licence     The MIT License (MIT)
  * @author      ZhixinLiu(zhixin.liu@dfrobot.com)
  * @version     V0.2
  * @date        2019-10-10
  * @get         from https://www.dfrobot.com
  * @url   */
#include "DFRobot_OzoneSensor.h"

#define COLLECT_NUMBER   20              // collect number, the collection range is 1-100
#define Ozone_IICAddress OZONE_ADDRESS_3
/*   iic slave Address, The default is ADDRESS_3
       ADDRESS_0               0x70      // iic device address
       ADDRESS_1               0x71
       ADDRESS_2               0x72
       ADDRESS_3               0x73
DFRobot_OzoneSensor Ozone;
void setup() 
  while(!Ozone.begin(Ozone_IICAddress)) {
    Serial.println("I2c device number error !");
  }  Serial.println("I2c connect success !");
/*   Set iic mode, active mode or passive mode
       MEASURE_MODE_AUTOMATIC            // active  mode
       MEASURE_MODE_PASSIVE              // passive mode

void loop() 
/*   Smooth data collection
       COLLECT_NUMBER                    // The collection range is 1-100
  int16_t ozoneConcentration = Ozone.ReadOzoneData(COLLECT_NUMBER);
  Serial.print("Ozone concentration is ");
  Serial.println(" PPB.");

Expected Results

Turn on the serial monitor and heat it up for about 3 minutes to get the final data. (Test environment: closed environment with ozone generator)

warning_yellow.png NOTE:

  • This Gravity: IIC Ozone Sensor may has data drift.
  • Please power it up for 24 hours when power it up for the first time.

Gravity__IIC_Ozone_Sensor_0-10PPM Result


For any questions, advice or cool ideas to share, please visit the DFRobot Forum.

More Documents